County annual report · FIPS 46109
2020 Roberts County, SD Power Outage Report
In 2020, customers in Roberts County, SD went without power for an average of 2.5 hours, a total of 10K customer-hours (South Dakota average 4.6 hours). That ranks 37th worst of 62 South Dakota counties and 2061st of 3,019 nationally.
Compared with SD, the US and 2019
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Roberts County, 2020
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | June 21, 2020 02:00 | June 21, 2020 03:15 | 1h 15m | 1,155 | 1,122 |
| 2 | December 23, 2020 10:45 | December 23, 2020 12:30 | 1h 45m | 1,003 | 1,755 |
| 3 | September 8, 2020 21:15 | September 11, 2020 20:15 | 2d 23h | 659 | 1,105 |
| 4 | April 5, 2020 12:30 | April 10, 2020 17:00 | 5d 4h | 642 | 1,399 |
| 5 | July 7, 2020 14:00 | July 9, 2020 23:00 | 2d 9h | 592 | 213 |
| 6 | July 11, 2020 04:45 | July 11, 2020 05:00 | 15m | 591 | 148 |
| 7 | July 18, 2020 04:15 | July 18, 2020 08:30 | 4h 15m | 591 | 1,682 |
| 8 | September 27, 2020 22:15 | September 27, 2020 22:30 | 15m | 485 | 121 |
| 9 | October 31, 2020 21:30 | October 31, 2020 21:45 | 15m | 485 | 121 |
| 10 | November 15, 2020 09:00 | November 15, 2020 09:15 | 15m | 485 | 121 |
Outage episodes by size in 2020: 12 reached 100+ customers, 2 reached 1,000+ customers, 0 reached 10,000+ customers.
Utility reliability filed with the EIA
SAIDI (average outage time per customer) and SAIFI (average interruptions per customer) that utilities serving Roberts County reported on EIA Form 861 for 2020, or their most recent earlier filing. Utility-wide figures, not county-specific.
| Utility | EIA year | SAIDI | SAIFI | SAIDI excl. major events | SAIFI excl. major events |
|---|---|---|---|---|---|
| Otter Tail Power Co | 2020 | 1.6 hrs | 1.40 | 1.6 hrs | 1.40 |
| Whetstone Valley Elec Coop Inc | 2018 | 73 min | 0.64 | 42 min | 0.43 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Montana-Dakota Utilities Co | - | - | - | - | - |
| Codington-Clark Elec Coop, Inc | - | - | - | - | - |
| Traverse Electric Coop, Inc | - | - | - | - | - |
| Lake Region Electric Assn, Inc - (SD) | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 79% of South Dakota's customers in 2020; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 4,096 customers (ORNL modeled county customer count), including major storm days. It is comparable across counties but is not the SAIDI a utility files.
- An outage event is a continuous stretch with customers out; counts at 100, 1,000 and 10,000+ use its peak.
- Years loaded: 2015–2025. Roberts County has data for 2019–2025.
Cite this report
MassOutage (massoutage.com), Roberts County, SD annual power outage report, 2020, data as of Oct 3, 2026 02:41 UTC, sources: DOE EAGLE-I (https://eagle-i.doe.gov/); EAGLE-I modeled customer counts (MCC) (https://figshare.com/); EIA Form 861 (utility reliability) (https://www.eia.gov/electricity/data/eia861/). https://massoutage.com/reports/2020/south-dakota/roberts-county